[en] Measurements of the superconducting critical temperature T/sub c/, critical current density, J/sub c/ (8< H<22.5 T), and the critical magnetic field H/sub c2/ were made on bronze processed (Nb,Ta)₃Sn monofilamentary wires. Ta content in the Nb₃Sn compound was varied by alloying the Nb core prior to a reaction heat treatment. Core compositions were 0, 3, 7, 10, and 20 wt% Ta and heat treatments for the reaction were 16, 64, and 120 h at 725⁰C. For the 120 h heat treatment T/sub c/ decreased monotonically with Ta content from 17.5 to 15.7K while H/sub c2/ increased from 19.8 to 24.6 T. With increasing Ta content J/sub c/ (16 T) increased from 0.7 x 10⁵ A/cm² to a maximum value of 1.3 x 10⁵ at 7 wt% Ta. Further increases in the Ta content produced a decrease in J/sub c/(16 T). At 10 T J/sub c/ decreased with increasing Ta content. An important aspect of this work is the observation that alloying with Ta did not hinder wire ductility during drawing. It appears therefore that the improvements in J/sub c/(16 T) can be incorporated into commercially manufactured conductors